chemical cleaning of cold box deposits:10th refinery of south pars case study

This study dealing with reduction in gas production due to cold box fouling in 10th refinery of south pars gas complex in iran well known as south pars phase 19. data comparison has done for timeline periods before and after the refinery annual turnaround. compelet investigations were done to identify the source of cold box pressure drop in ethane recovery unit and xylene solvent wash was chosen as aproperiate cure method. a procedure was designed and performed during refinery shutdown time interval. cold box pressure drop decreased after chemical wash. as a result, the production rate has increased about 188 ton/hr for all gas trains with approximately 387 million usd/year revenue.